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        <h1 id="生成jni头文件："><a href="#生成jni头文件：" class="headerlink" title="生成jni头文件："></a>生成jni头文件：</h1><ul>
<li>第一种<br>比如包的名字是 com.example.test，类的名字是 hellojni，<br>类文件路径是src/com/example/test/hellojni.class<br>那么我们需要在src目录下，使用命令<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">javah -jni com.example.test.hellojni</span><br></pre></td></tr></table></figure>
</li>
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<ul>
<li>第二种</li>
</ul>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#!/bin/sh</span></span><br><span class="line">javah -classpath build/intermediates/classes/armv7/debug:libs/opencv-sdk.jar -o jni/ocr_jni.h com.polysfactory.opencvocr.jni.NativeMarkerDetector</span><br></pre></td></tr></table></figure>
<p>1、编译路径为build/intermediates/classes/armv7/debug，名为com.polysfactory.opencvocr.jni.NativeMarkerDetector的class文件。<br>2、输出路径为jni，在jni目录下生成名为ocr_jni.h文件。<br>3、编译依赖libs/opencv-sdk.jar。</p>
<p>因为源文件中使用了opencv的类<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.polysfactory.opencvocr.jni;</span><br><span class="line"><span class="keyword">import</span> org.opencv.core.Mat;</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">NativeMarkerDetector</span> </span>&#123;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">long</span> mNativeObj;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">NativeMarkerDetector</span><span class="params">(String nm1File, String nm2File)</span> </span>&#123;</span><br><span class="line">        mNativeObj = nativeCreateObject(nm1File, nm2File);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doOcr</span><span class="params">(Mat imageBgra, <span class="keyword">float</span> scale)</span> </span>&#123;</span><br><span class="line">        Mat transformationsMat = <span class="keyword">new</span> Mat();</span><br><span class="line">        nativeFindMarkers(mNativeObj, imageBgra.nativeObj, transformationsMat.nativeObj, scale);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">release</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        nativeDestroyObject(mNativeObj);</span><br><span class="line">        mNativeObj = <span class="number">0</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">native</span> <span class="keyword">long</span> <span class="title">nativeCreateObject</span><span class="params">(String nm1File, String nm2File)</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">native</span> <span class="keyword">void</span> <span class="title">nativeFindMarkers</span><span class="params">(<span class="keyword">long</span> thiz, <span class="keyword">long</span> imageBgra, <span class="keyword">long</span> transformations, <span class="keyword">float</span> scale)</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">native</span> <span class="keyword">void</span> <span class="title">nativeDestroyObject</span><span class="params">(<span class="keyword">long</span> thiz)</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h1 id="Application-mk"><a href="#Application-mk" class="headerlink" title="Application.mk"></a>Application.mk</h1><h3 id="一个实例："><a href="#一个实例：" class="headerlink" title="一个实例："></a>一个实例：</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">APP_STL := gnustl_static</span><br><span class="line">APP_CPPFLAGS := -frtti -fexceptions</span><br><span class="line">APP_ABI := armeabi armeabi-v7a x86 mips arm64-v8a x86_64 mips64</span><br><span class="line">APP_PLATFORM := android-14</span><br><span class="line">APP_OPTIM := release</span><br></pre></td></tr></table></figure>
<h3 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h3><p>Application.mk目的是描述在你的应用程序中所需要的模块(即静态库或动态库)。<br>Application.mk文件通常被放置在 <code>$PROJECT/jni/Application.mk</code>下，$PROJECT指的是您的项目。<br>要将C\C++代码编译为so文件，光有Android.mk文件还不行，还需要一个Application.mk文件。</p>
<ol>
<li><p>APP_PROJECT_PATH  ： 这个变量是强制性的，并且会给出应用程序工程的根目录的一个绝对路径。这是用来复制或者安装一个没有任何版本限制的JNI库，从而给APK生成工具一个详细的路径。</p>
</li>
<li><p>APP_MODULES  ：   这个变量是可选的，如果没有定义，这个模块名字被定义在Android.mk文件中的 LOCAL_MODULE 中。NDK将由在Android.mk中声明的默认的模块编译，并且包含所有的子文件（makefile文), NDK会自动计算模块的依赖。<br>如果APP_MODULES定义了，它必须是一个空格分隔的模块列表( 注意：NDK在R4开始改变了这个变量的行为，在此之前： 在Application.mk中，该变量是强制的必须明确列出所有需要的模块)</p>
</li>
<li><p>APP_OPTIM ：   这个变量是可选的，用来定义“release”或”debug”。在编译您的应用程序模块的时候，可以用来改变优先级。“release”模式是默认的，并且会生成高度优化的二进制代码。”debug”模式生成的是未优化的二进制代码，但可以检测出很多的BUG，可以用于调试。<br>注意：如果你的应用程序是可调试的（即，如果你的清单文件在它的<application>标签中把android:debuggable属性设为true），默认将是debug而非release。把APP_OPTIM设置为release可以覆写它。注意：可以调试release和debug版二进制，但release版构建倾向于在调试会话中提供较少信息：一些变量被优化并且不能被检测，代码重新排序可能致使代码步进变得困难，堆栈跟踪可能不可靠，等等。</application></p>
</li>
<li><p>APP_CFLAGS ： 一个C编译器开关集合，在编译任意模块的任意C或C++源代码时传递。它可以用于改变一个给定的应用程序需要依赖的模块的构建，而不是修改它自身的Android.mk文件。APP_CPPFLAGS在Android NDK-1.5_r1中，这个标志可以应用于C和C++源文件中，现已不建议使用。</p>
</li>
<li><p>APP_BUILD_SCRIPT ： 默认，NDK构建系统将在 $(APP_PROJECT_PATH)/jni 下寻找一个名为 Android.mk 的文件。即，对于这个文件$(APP_PROJECT_PATH)/jni/Android.mk 如果你想重载这个行为，你可以定义APP_BUILD_SCRIPT指向一个不同的构建脚本。 一个非绝对路径将总是被解析为相对于NDK顶级目录的路径。</p>
</li>
<li><p>APP_ABI ： 默认情况下，NDK的编译系统根据 “armeabi” ABI生成机器代码。可以使用APP_ABI 来选择一个不同的ABI。比如：为了在ARMv7的设备上支持硬件FPU指令。可以使用  APP_ABI := armeabi-v7a<br>或者为了支持IA-32指令集，可以使用      APP_ABI := x86<br>或者为了同时支持这三种，可以使用       APP_ABI := armeabi armeabi-v7a x86</p>
</li>
<li><p>APP_STL ：默认，NDK构建系统提供由Android系统给出的最小C++运行时库（/system/lib/libstdc++.so）的C++头文件。 然而，NDK带有另一个C++实现，你可以在你自己的应用程序中使用或链接它。<br>定义APP_STL以选择它们其中的一个：<br>APP_STL := stlport_static    –&gt;     static STLport library<br>APP_STL := stlport_shared    –&gt;     shared STLport library<br>APP_STL := system            –&gt;      default C++ runtime library</p>
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